<template>
  <div>
    <!--面包屑导航-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图-->
    <el-card>
      <!--添加角色按钮-->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <el-table border stripe :data="rolesList">
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row
              :class="['bd-bottom', (i1 === 0) ? 'bd-top' : '', 'v-center' ]"
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id"
            >
              <!-- 渲染一级权限-->
              <el-col :span="5">
                <el-tag closable @close="removeById(scope.row, item1.id)">{{ item1.authName }}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级权限、三级权限-->
              <el-col :span="19">
                <!-- 渲染耳机权限 -->
                <el-row
                  :class="[(i2 === 0) ? '' : 'bd-top', 'v-center' ]"
                  v-for="(item2, i2) in item1.children"
                  :key="item2.id"
                >
                  <el-col :span="6">
                    <el-tag
                      closable
                      type="success"
                      @close="removeById(scope.row, item2.id)"
                    >{{ item2.authName }}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag
                      :class="[(i3 === 0) ? '' : 'bd-top' ]"
                      v-for="(item3, i3) in item2.children"
                      :key="item3.id"
                      closable
                      type="warning"
                      @close="removeById(scope.row, item3.id)"
                    >{{ item3.authName }}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <el-table-column label="#" type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            <el-button
              size="mini"
              type="warning"
              icon="el-icon-setting"
              @click="showSetRightDialog(scope.row)"
            >分配权限</el-button>
            <input type="hidden" :value="scope" />
          </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!--分配权限对话框-->
    <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree
        :data="rightsList"
        :props="treeProps"
        show-checkbox
        node-key="id"
        :default-expand-all="true"
        :default-checked-keys="defKeys"
        ref="treeRef"
      ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data () {
    return {
      // 角色列表数据
      rolesList: [],

      // 展示分配权限对话框
      setRightDialogVisible: false,

      // 所有权限数据
      rightsList: [],

      // 树形控件对应对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的权限
      defKeys: [],
      // 即将分配角色的role id
      roleId: ''
    }
  },
  methods: {
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.rolesList = res.data
    },
    // 删除权限
    async removeById (role, rightId) {
      const confirmRes = await this.$confirm('是否删除该权限？', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmRes !== 'confirm') {
        return this.$message.info('取消删除权限')
      }
      const { data: res } = await this.$http.delete(
        `/roles/${role.id}/rights/${rightId}`
      )
      if (res.meta.status === 200) {
        role.children = res.data
        return this.$message.success('删除权限成功')
      } else {
        return this.$message.error('取消删除权限')
      }
    },
    // 展示分配权限对话框
    async showSetRightDialog (role) {
      this.roleId = role.id
      // 获取所有权限数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.info('获取权限失败')
      }
      this.rightsList = res.data
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归的形式获取所有当前选择角色下所有三级权限
    getLeafKeys (node, arr) {
      if (!node.children) {
        arr.push(node.id)
        return arr
      } else {
        return node.children.forEach(item => this.getLeafKeys(item, arr))
      }
    },
    // 关闭对话框时，重置当前的三级权限
    setRightDialogClosed () {
      this.defKeys = []
    },
    // 分配权限
    async allotRights () {
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, {
        rids: [
          ...this.$refs.treeRef.getCheckedKeys(),
          ...this.$refs.treeRef.getHalfCheckedKeys()
        ].join(',')
      })
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.setRightDialogVisible = false
      this.getRolesList()
    }
  },
  created () {
    this.getRolesList()
  }
}
</script>
<style lang="less" scoped>
.el-table {
  margin-top: 15px;
}
.el-tag {
  margin: 7px;
}
.bd-top {
  border-top: solid 1px #eee;
}
.bd-bottom {
  border-bottom: solid 1px #eee;
}
.v-center {
  display: flex;
  align-items: center;
}
</style>
